JP2022544915A - Repeater and method of operation thereof - Google Patents

Abstract

A repeater and method of operation thereof are provided. Kind Code: A1 A method of operating a repeater operating in a time division duplex (TDD) method includes steps of detecting a synchronization signal from a received signal, determining a type of communication period based on the detected synchronization signal, and determining a type of communication period based on the detected synchronization signal. and controlling operation of the signal linearizer based on the type of communication period detected. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a repeater and its operation method, and more particularly, to a repeater capable of controlling at least part of the operation of a signal linearizer according to the type of communication period determined based on a synchronization signal. and its method of operation.

The present invention is a high-power, high-efficiency, low-delay, dual-mode (WiBro and TD-LTE) cell coverage extension of the same-frequency retransmission method using interference signal elimination technology in the TICN wireless network. This invention is the result of the implementation of the device development project (Civil-Military Issue No. UM17408RD4).

Linearization techniques for improving the efficiency of power amplifiers, which are the main component of communication equipment, include the DPD (Digital Pre-Distortion) method and the APD (Adaptive Pre-Distortion) method using RFPAL (RF Power Amplifier Linearizer). Mainly used.

In 5G communication, the distortion of the transmitted communication signal is more severe than in existing 3G communication and 4G communication, so the performance of the linearization device is degraded, and the overall performance of the communication equipment is degraded due to this. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a repeater capable of controlling at least part of the operation of a signal linearizer according to the type of communication period determined based on a synchronization signal, and a method of operating the repeater. is.

A method of operating a repeater operating in a Time Division Duplex (TDD) scheme according to an embodiment of the present invention includes steps of detecting a synchronization signal from a received signal, and determining a type of communication period based on the detected synchronization signal. and controlling operation of the signal linearizer based on the determined type of communication period.

According to example embodiments, determining the type of the communication period determines whether the type of the communication period is a downlink communication period based on the synchronization signal.

According to an embodiment, controlling operation of the signal linearizer activates operation of at least a portion of the signal linearizer when the type of communication period is the downlink communication period.

According to an embodiment, controlling the operation of the signal linearizer at least partially deactivates the operation of the signal linearizer if the type of communication period is not the downlink communication period.

According to some embodiments, the operation of the signal linearizer is an operation of performing Digital Pre-Distortion (DPD) on the received signal.

According to an embodiment, controlling the operation of the signal linearizer includes calculating coefficients for performing the digital predistortion of the signal linearizer when the type of communication period is not the downlink communication period. Abort an operation or coefficient update operation.

According to example embodiments, the operation of the signal linearizer is to perform adaptive pre-distortion (APD) on the received signal.

According to an embodiment, controlling the operation of the signal linearizer includes operations for performing the adaptive predistortion of the signal linearizer when the type of communication period is not the downlink communication period. Abort an operation or coefficient update operation.

According to an embodiment, the operating method of the repeater sets a coefficient using a preset coefficient value when a size variation of the received signal exceeds a reference value.

According to example embodiments, the initialized coefficient values are stored in the form of a lookup table.

A repeater operating in the TDD system according to an embodiment of the present invention includes a synchronization detector that detects a synchronization signal from a received signal, a type of communication period that is determined based on the detected synchronization signal, and a determined communication period. A controller for generating a control signal based on the type, and a signal linearizer for controlling a linearization operation of the received signal based on the generated control signal.

According to an embodiment, the signal linearizer is at least partially activated when the communication period type is a downlink communication period, and when the communication period type is not the downlink communication period, At least a portion is deactivated.

In some embodiments, the signal linearizer performs DPD on the received signal.

In some embodiments, the signal linearizer performs APD on the received signal.

The method and apparatus according to an embodiment of the present invention control at least a part of the operation of the signal linearizer according to the type of communication period determined based on the synchronization signal, thereby eliminating unnecessary calculation processes of the signal linearizer. can be reduced, and the stability of signal linearization in a TDD (Time Division Duplex) communication system in which uplink communication and downlink communication are switched at a high speed can be improved.

1 is a conceptual diagram of a communication system according to one embodiment of the present invention; FIG. 2 is a block diagram according to one embodiment of the repeater shown in FIG. 1; FIG. 3 is a block diagram according to one embodiment of the digital signal processor shown in FIG. 2; FIG. 4 is a diagram illustrating timings of uplink communication and downlink communication in a TDD-based interference cancellation repeater; 3 is a block diagram according to one embodiment of the output linearizer and amplifier shown in FIG. 2; FIG. 6 is a block diagram according to one embodiment of the signal linearizer shown in FIG. 5; FIG. FIG. 7 is a diagram illustrating an embodiment of the coefficient lookup table of FIG. 6; FIG. 4 is a flowchart of a repeater operating method according to an embodiment of the present invention;

Since the technical idea of the present invention can be modified in various ways and can have various embodiments, specific embodiments will be illustrated in the drawings and will be described in detail. However, this is not intended to limit the technical idea of the present invention by a specific embodiment, but is understood to include all modifications, equivalents or alternatives within the scope of the technical idea of the present invention. I have to.

In describing the technical idea of the present invention, if it is determined that the detailed description of the known technology unnecessarily obscures the gist of the present invention, the detailed description will be omitted. Also, numbers (eg, first, second, etc.) used in the description of the present specification are merely identification symbols for distinguishing one component from other components.

Also, in this specification, when one component is referred to as being “coupled” or “connected” to another component, the one component is directly coupled to the other component. or directly connected, but unless there is a description to the contrary, it should be understood that they may be connected or connected via another component in between.

In addition, terms such as "-unit", "-device", "-child", "-module" described in this specification mean a unit for processing at least one function or operation, which is a processor 、マイクロプロセッサ、マイクロコントローラ、ＣＰＵ（Ｃｅｎｔｒａｌ Ｐｒｏｃｅｓｓｉｎｇ Ｕｎｉｔ）、ＧＰＵ（Ｇｒａｐｈｉｃｓ Ｐｒｏｃｅｓｓｉｎｇ Ｕｎｉｔ）、ＡＰＵ（Ａｃｃｅｌｅｒａｔｅ Ｐｒｏｃｅｓｓｏｒ Ｕｎｉｔ）、ＤＳＰ（Ｄｒｉｖｅ Ｓｉｇｎａｌ Ｐｒｏｃｅｓｓｏｒ）、ＡＳＩＣ（Ａｐｐｌｉｃａｔｉｏｎ Ｓｐｅｃｉｆｉｃ Ｉｎｔｅｇｒａｔｅｄ Ｃｉｒｃｕｉｔ）、ＦＰＧＡ（Ｆｉｅｌｄ Ｐｒｏｇｒａｍｍａｂｌｅ Ｇａｔｅ Ａｒｒａｙ） It may be embodied as a combination of hardware and software, or a combination of hardware and software, and may be embodied in a form coupled with a memory that stores data necessary for processing at least one function or operation.

In addition, it will be clarified that the division of the constituent parts in this specification is nothing more than division according to the main function that each constituent part is in charge of. That is, two or more components described below may be combined into one component, or one component may be divided into two or more according to subdivided functions. In addition, each of the components described below may perform some or all of the functions assigned to other components in addition to the main functions it is responsible for. It goes without saying that some of the functions may be performed exclusively by other components.

FIG. 1 is a conceptual diagram of a communication system according to one embodiment of the present invention.

Referring to FIG. 1, a communication system 10 according to an embodiment of the present invention includes a base station 100, a wireless communication terminal 200, and a repeater 300. FIG.

The wireless communication terminal 200 means a device capable of wireless communication according to various mobile communication standards, and may be modified in various forms.

The relay 300 relays communication between the base station 100 and the wireless communication terminal 200 .

Depending on the embodiment, the repeater 300 may be a 2G mobile communication network such as global system for mobile communication (GSM) or code division multiple access (CDMA), a wideband code division multiple access (WCDMA) or H3GSD mobile communication network such as CDMA2000. 3.5G mobile communication networks such as (high speed downlink packet access) or HSUPA (high speed uplink packet access), 4G mobile communication networks such as LTE (long term evolution) or LTE-Advanced, 5G mobile communication networks (NSA (Non --Stand Alone) or SA (Stand Alone)), 6G mobile communication network, later generation mobile communication network, or a communication network configured with a combination thereof.

The repeater 300 receives a communication signal (eg, base station signal) transmitted from the base station 100 through the first antenna ANT1, and transmits the received communication signal (eg, base station signal) through the second antenna ANT2. Relay to the wireless communication terminal device 200 .

In some embodiments, the communication signal is a wireless communication signal (eg, a Radio Frequency (RF) signal).

The first antenna ANT1 is called the donor antenna and the second antenna ANT2 is called the service or coverage antenna, but is not limited to these.

Depending on the embodiment, the repeater 300 is implemented as an ICS (Interference Cancellation System) repeater.

Although FIG. 1 shows that the repeater 300 relays communication between one base station 100 and one wireless communication terminal 200 for convenience of explanation, the repeater 300 may communicate with a plurality of base stations. Communication with a plurality of wireless communication terminals may be relayed. According to another embodiment, repeater 300 may relay communications between base station 100 and other repeaters (not shown).

The detailed structure and operation of repeater 300 will be described in detail with reference to FIG.

FIG. 2 is a block diagram according to one embodiment of repeater 300 shown in FIG.

1 and 2, the repeater 300 includes an RF receiver 310, an input attenuation adjustment unit 320, an analog-to-digital converter (ADC) 330, a digital signal processor 340, an input measurement unit. 350 , an automatic level controller 360 , a digital-to-analog converter (DAC) 370 , an output gain adjustment unit 380 and an output linearizer and amplifier 390 .

The RF receiver 310 removes noise from the received signal received through the first antenna ANT1, down-converts the noise-free received signal, and outputs the resultant signal.

Depending on the embodiment, the RF receiver 310 may include a band pass filter (BPF) for passing only the service signal band from the received signal, a low noise amplifier (LNA), and a received signal in the RF frequency band. to an intermediate frequency (IF) band signal, and a frequency downward converter to convert the intermediate frequency band signal to a baseband signal.

The input attenuation adjustment unit 320 receives the received signal processed and output by the RF receiver 310 and adjusts the size of the received signal under the control of the automatic level controller 360 so as not to exceed the saturation level of the ADC 330. .

ADC 330 converts the received signal whose size has been adjusted by input attenuation adjustment unit 320, ie, an analog signal, into a digital signal.

The digital signal processor 340 filters and outputs an interference signal contained in the digital signal converted and output by the ADC 330 . Depending on the embodiment, the digital signal processor 340 may perform a DPD (Digital Pre-Distortion) operation, a CFR (Crest Factor Reduction) operation, and the like.

Depending on the embodiment, the digital signal processor 340 may feed back the signal output from the output linearizer and amplifier 390 and use the fed-back signal for DPD or CFR operation.

According to an embodiment, when the DPD operation is performed in the digital signal processor 340, an exemplary configuration and operation for this will be described later with reference to FIG.

The input measurement unit 350 measures the peak power of the input signal processed by the digital signal processor 340 during the reference time interval and outputs the measured peak power value to the automatic level controller 360 .

According to an embodiment, the input measurement unit 350 adjusts the length of the reference time interval, ie, the peak power measurement period of the input signal, according to the size of the input signal. For example, the input measurement unit 350 increases the length of the reference time interval when the size of the input signal is relatively large, and shortens the length of the reference time interval when the size of the input signal is relatively small.

The automatic level controller 360 performs automatic level control (ALC) operation based on the peak power value of the input signal measured by the input measurement unit 350 . According to an embodiment, when the peak power of the input signal exceeds the reference value, the automatic level controller 360 adjusts the attenuation of the input attenuation adjustment unit 320 to limit the peak value of the input signal in the middle of the next reference time interval. The gain of ratio and output gain control unit 380 may be controlled.

DAC 370 converts the digital signals processed by digital signal processor 340 to analog signals.

Output gain control unit 380 receives the received signal converted and output by DAC 370 and compensates for the size of the received signal attenuated by attenuation control unit 320 under the control of automatic level controller 360 .

The output linearizer and amplifier 390 amplifies the received signal whose size has been compensated by the output gain control unit 380, linearizes and outputs the amplified received signal. Depending on the embodiment, the output linearizer and amplifier 390 may further comprise a filter for filtering the amplified signal.

The detailed structure and operation of output linearizer and amplifier 390 are described in detail with reference to FIGS.

FIG. 3 is a block diagram of one embodiment of the digital signal processor shown in FIG. FIG. 4 is a diagram illustrating timings of uplink communication and downlink communication in a TDD-based interference cancellation repeater.

Referring to FIGS. 2 and 3, digital signal processor 340 comprises scaler 342 , DPD signal generator 344 , signal adder 346 , sync detector 347 and controller 348 .

Although FIG. 3 shows only an exemplary configuration for performing the DPD operation in the digital signal processor 340 for convenience of explanation, the digital signal processor 340 may be further provided with various configurations.

Scaler 342 performs a scaling operation to compensate for scale differences between the received signal transmitted from ADC 330 and the distorted signal fed back from output linearizer and amplifier 390 . Scaler 342 outputs the scaled received signal.

DPD signal generator 344 generates a DPD signal for DPD processing based on the received signal transmitted from ADC 330 and the distorted signal fed back from output linearizer and amplifier 390 .

According to an embodiment, the DPD signal generator 344 generates a DPD signal corresponding to the received signal using coefficient values stored in a lookup table (LUT) prestored in a memory (not shown). may

According to another embodiment, the DPD signal generator 344 may compute the coefficient values used to generate the DPD signal based on the received signal and the distorted signal fed back.

A signal adder 346 combines the scaled received signal and the DPD signal and outputs the DPD processed signal to the DAC 370 side.

The scaler 342, the DPD signal generator 344, and the signal adder 346 are an example of the signal linearizer 341 for linearizing the signal in the digital domain, and may be modified in various configurations.

Depending on the embodiment, signal linearizer 341 may perform digital predistortion.

A sync detector 347 detects a sync signal from the received signal.

A method for detecting the synchronization signal by the synchronization detector 347 may be variously implemented.

実施形態によって、同期検出器３４７は、受信信号からＰＳＳ（Ｐｒｉｍａｒｙ Ｓｙｎｃｈｒｏｎｉｚａｔｉｏｎ Ｓｉｇｎａｌ）、ＳＳＳ（Ｓｅｃｏｎｄａｒｙ Ｓｙｎｃｈｒｏｎｉｚａｔｉｏｎ Ｓｉｇｎａｌ）、ＳＳ（Ｓｙｎｃｈｒｏｎｉｚａｔｉｏｎ Ｓｉｇｎａｌ）／ＰＢＣＨ（Ｐｈｙｓｉｃａｌ Ｂｒｏａｄｃａｓｔ Ｃｈａｎｎｅｌ）、ＤＭＲＳ（Ｄｅｍｏｄｕｌａｔｉｏｎ Ｒｅｆｅｒｅｎｃｅ Ｓｉｇｎａｌ）、及びＣＰ（ The synchronization signal is detected by detecting at least one of the Cyclic Prefixes.

Controller 348 determines the type of communication period based on the synchronization signal detected by synchronization detector 347 .

Referring also to FIG. 4, controller 348 determines frame boundaries (the start or end of the frame) within the received signal based on the detected synchronization signal (eg, SYNC1 or SYNC2).

In addition, the controller 348 uses information about the detected frame boundaries and TDD pattern information (eg, UL-DL configuration information, etc.) of the received signal to determine whether the communication period is a downlink communication period (eg, DL1 or DL2). or during an uplink communication period (eg, UL1 or UL2).

In some embodiments, the controller 348 determines the interval between the downlink communication period (eg, DL1) and the uplink communication period (eg, UL1) as a guard period (eg, GP1) and the uplink communication period (eg, GP1). For example, the interval between UL1) and the downlink communication period (eg, DL2) may be determined as an uplink-downlink transition gap (eg, TG1). According to other embodiments, controller 348 may make the opposite decision.

Returning to FIG. 3, the controller 348 determines whether the communication period type is a downlink communication period based on the determined communication period type, and generates a control signal according to the determination result.

In some embodiments, controller 348 activates operation of at least a portion of signal linearizer 341 (eg, scaler 342 or DPD signal generator 344) when the determined type of communication period is a downlink communication period. You can turn it into

In some embodiments, the controller 348 controls the signal linearity when the determined communication period type is not a downlink communication period (eg, an uplink communication period, a guard period, or an uplink-downlink transition gap period, etc.). The operation of at least a portion of generator 341 (eg, scaler 342 or DPD signal generator 344) may be deactivated (or ceased).

In some embodiments, the controller 348 controls the signal linearity when the determined communication period type is not a downlink communication period (eg, an uplink communication period, a guard period, or an uplink-downlink transition gap period, etc.). In order to generate the DPD signal in the generator 341, the operation of calculating the coefficients or the operation of updating the coefficients may be deactivated (or stopped).

Depending on the embodiment, the sync detector 347 may be implemented separately outside the digital signal processor 340 .

FIG. 5 is a block diagram according to one embodiment of the output linearizer and amplifier shown in FIG. FIG. 6 is a block diagram according to one embodiment of the signal linearizer shown in FIG. FIG. 7 is a diagram illustrating one embodiment of the coefficient lookup table of FIG.

2 and 5, output linearizer and amplifier 390 includes input coupler 392, delay circuit 394, correction unit 396, amplifier 398, feedback coupler 400, synchronous detector 402, controller 404, and signal linearizer 390. a generator 410;

The input coupler 392 couples the input RF signal RF_IN output from the output gain control unit 380 and transmits it to the delay circuit 394 and the signal linearizer 410 .

The delay circuit 394 delays the input RF signal input to the delay circuit 394 by a time necessary for signal linearization computation in the signal linearizer 410 and outputs the delayed signal.

The correction unit 396 linearizes the input RF signal delayed by the delay 394 based on the corrected RF signal RF_CR output from the signal linearizer 410 .

Amplifier 398 amplifies and outputs the input RF signal corrected by correction unit 396 .

The feedback coupler 400 couples the input RF signal amplified by the amplifier 398 and transmits it to the wireless communication terminal 300 through the second antenna ANT2 on one side and the signal linearizer 410 on the other side. feedback to That is, the feedback RF signal RF_FB fed back by the feedback coupler 400 corresponding to the input RF signal RF_IN is input to the signal linearizer 410 together with the input RF signal RF_IN.

A sync detector 402 detects a sync signal from the received signal. It may perform substantially the same function as sync detector 347 of FIG.

Depending on the embodiment, the synchronous detector 402 may be implemented separately outside the output linearizer and amplifier 390 .

Controller 404 determines the type of communication period based on the synchronization signal detected by synchronization detector 402 . Controller 404 generates control signals to control the operation of signal linearizer 410 based on the determined type of communication period.

Depending on the embodiment, controller 404 may perform substantially the same operation as controller 348 of FIG. 3, except that the controlled object is different.

Depending on the embodiment, the controller 404 may be embodied separately outside the output linearizer and amplifier 390 or as a function of the digital signal processor (340 in FIG. 2).

Signal linearizer 410 generates corrected RF signal RF_CR based on input RF signal RF_IN and feedback RF signal RF_FB.

In some embodiments, signal linearizer 410 is controlled in linearization operation based on control signals generated by controller 404 .

Depending on the embodiment, the signal linearizer 410 may be placed and embodied at other locations than the output linearizer and amplifier 390 .

6, signal linearizer 410 comprises input power measurement unit 412, processor 414, coefficient LUT 416, coefficient calculator 418, coefficient selector 420, and correction signal generator 422. FIG.

The input power measurement unit 412 measures the power of the input RF signal, ie the size of the input RF signal RF_IN. Input power measurement unit 412 transmits the measured size of input RF signal RF_IN to processor 414 .

Based on the size of the input RF signal RF_IN transmitted from the input power measurement unit 412, the processor 414 compares the size change value of the input RF signal RF_IN within a unit time with the reference value.

The processor 414 selects a mode of outputting coefficients used for signal linearization according to whether the size change value of the input RF signal RF_IN in unit time exceeds a reference value.

According to an embodiment, the processor 414 reads the first linearization coefficient CE1 from the coefficient LUT 416 and outputs the read first linearization coefficient CE1 when the size change value of the input RF signal RF_IN in unit time exceeds the reference value. You may
Coefficient LUT 416 contains a first set of linearization coefficients according to the size of input RF signal RF_IN. At this time, the first linearization coefficient stored in the coefficient LUT 416 is also the initialized coefficient value.

Referring also to FIG. 7, the coefficient LUT 416 stores the first linearization coefficients for each size of the input RF signal RF_IN in the form of a table. For example, when the size of the input RF signal RF_IN is maximum, the first linearization coefficient is set to 'a', and when the size of the input RF signal RF_IN is minimum, the first linearization coefficient is set to 'z'.

Returning to FIG. 6, according to another embodiment, coefficient LUT 416 may comprise a set of first linearization coefficients according to other parameters (eg, temperature, etc.). In this case, the input power measurement unit 412 is omitted.

Coefficient operator 418 receives both input RF signal RF_IN transmitted from input coupler 392 and feedback RF signal RF_FB transmitted from feedback coupler 400 . The coefficient calculator 418 compares the received input RF signal RF_IN and the feedback RF signal RF_FB and generates a second linearization coefficient CE2 according to the comparison result.

According to an embodiment, if the second linearization coefficient CE2 is generated in the coefficient operator 418, the processor 414 performs a first linearization of the coefficient LUT 416 using the size of the input RF signal RF_IN and the second linearization coefficient CE2. Coefficient CE1 may be updated. For example, if the first linearization coefficient CE1 stored in the coefficient LUT 416 corresponding to the input RF signal RF_IN size 'A' is 'a' and the coefficient operator 418 for the same input RF signal RF_IN size 'A' is 'a1', the value 'a' stored in the coefficient LUT 416 is updated to 'a1'.

The coefficient selector 420 generates the first linearization coefficient CE1 obtained from the coefficient LUT 416 and output from the processor 414 based on the selection signal SEL transmitted from the processor 414 and the calculation result of the coefficient calculator 418 . One of the second linearization coefficients CE2 is selected and output to the correction signal generator 422 .

Depending on the embodiment, the coefficient selector 420 may be embodied in a form included in the processor 414 or variously embodied in a form included in the coefficient calculator 418 .

The correction signal generator 422 receives the linearization coefficient selected and output by the coefficient selector 420, e.g., the first linearization coefficient CE1 or the second linearization coefficient CE2, and converts the received linearization coefficient (CE1 or CE2) is used to generate a corrected RF signal RF_CR.

The corrected RF signal RF_CR generated by the corrected signal generator 422 is transmitted to the correction unit 396, which uses the corrected RF signal RF_CR to perform correction for linearization of the input RF signal RF_IN.

Depending on the embodiment, at least a portion of signal linearizer 410 (eg, processor 414, coefficient operator 418, etc.) may be activated or deactivated (or ceased) under the control of controller 404. .

In some embodiments, controller 404 directs operation of at least a portion of signal linearizer 410 (eg, processor 414, coefficient operator 418, etc.) when the determined type of communication period is a downlink communication period. may be activated.

In some embodiments, the controller 404 may control the signal linearity if the determined communication interval type is not a downlink communication interval (eg, an uplink communication interval, a guard interval, or an uplink-downlink transition gap interval, etc.). Operation of at least a portion of generator 404 (eg, processor 414, or coefficient operator 418, etc.) may be deactivated (or ceased).

Depending on the embodiment, the controller 404 performs the coefficient operation when the determined type of communication period is not a downlink communication period (eg, an uplink communication period, a guard period, or an uplink-downlink transition gap period, etc.). The operation of calculating coefficients for signal linearization in unit 418 or the updating of coefficients by processor 414 may be deactivated (or ceased).

In some embodiments, signal linearizer 410 may perform adaptive pre-distortion (APD).

Depending on the embodiment, the signal linearizer 410 may be embodied in RFPAL (RF Power Amplifier Linearizer).

FIG. 8 is a flowchart of a repeater operating method according to an embodiment of the present invention.

1 through 8, repeater 300 detects a synchronization signal from a received signal (S810).

Depending on the embodiment, the repeater 300 may detect the synchronization signal from the received signal. For example, the synchronization detector is at least one of PSS, SSS, SS/PBCH, DMRS, and CP.

The repeater 300 determines the type of communication period based on the detected synchronization signal (S820).

Depending on the embodiment, the repeater 300 determines whether the communication period is a downlink communication period (eg, DL1 or DL2), an uplink communication period (eg, UL1 or UL2), or a guard period based on the synchronization signal. (eg, GP1) or an uplink-downlink transition gap interval (eg, TG1).

Depending on the embodiment, the repeater 300 determines the frame boundary (starting point or ending point of the frame) in the received signal based on the synchronization signal, and provides information about the detected frame boundary and TDD pattern information of the received signal. (eg, UL-DL configuration information, etc.) may be used to determine the type of communication period.

The repeater 300 controls the operation of the signal linearizer based on the determined type of communication period (S830).

Depending on the embodiment, the repeater 300 may activate operation of at least some of the signal linearizers (eg, 341 or 410) when the determined communication period is the downlink communication period.

According to another embodiment, the repeater 300 outputs a signal when the determined communication period is not a downlink communication period (eg, an uplink communication period, a guard period, or an uplink-downlink transition gap period, etc.). At least some operations of the linearizer (eg, 341 or 410) may be deactivated (or ceased). For example, the repeater 300 can stop the coefficient calculation operation or the coefficient update operation even during the operation of the signal linearizer (eg, 341 or 410).

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the above embodiments, and various modifications and changes can be made by those skilled in the art within the technical spirit and scope of the present invention.

Claims (14)

In a method for operating a repeater operating in a TDD (Time Division Duplex) system,
detecting a synchronization signal from the received signal;
determining a type of communication period based on the detected synchronization signal;
and controlling operation of a signal linearizer based on a determined type of communication period. The step of determining the type of communication period includes:
The method of operating a repeater according to claim 1, wherein, based on the synchronization signal, determining whether the type of communication period is a downlink communication period. Controlling the operation of the signal linearizer includes:
3. The method of operating a repeater according to claim 2, activating operation of at least a portion of said signal linearizer when said type of communication period is said downlink communication period. Controlling the operation of the signal linearizer includes:
3. The method of operating a repeater of claim 2, wherein if the type of communication period is not the downlink communication period, deactivating at least a portion of the signal linearizer. The operation of the signal linearizer is:
3. The method of operating a repeater according to claim 2, wherein the operation is to perform Digital Pre-Distortion (DPD) on the received signal. Controlling the operation of the signal linearizer includes:
6. The repeater of claim 5, wherein if the type of communication period is not the downlink communication period, the signal linearizer aborts a coefficient calculation operation or a coefficient update operation for performing the digital predistortion. How it works. The operation of the signal linearizer is:
3. The method of operating a repeater according to claim 2, wherein the operation is to perform Adaptive Pre-Distortion (APD) on the received signal. Controlling the operation of the signal linearizer includes:
8. The relay of claim 7, wherein if the type of communication period is not the downlink communication period, the signal linearizer aborts a coefficient calculation operation or a coefficient update operation for performing the adaptive predistortion. How the instrument works. The operating method of the repeater includes:
9. The method of operating a repeater according to claim 8, wherein if the size change of said received signal exceeds a reference value, a coefficient is set using a default coefficient value. The initialized coefficient values are
10. A method of operating a repeater according to claim 9, stored in the form of a lookup table. In a repeater operating in a TDD (Time Division Duplex) system,
a synchronization detector for detecting a synchronization signal from a received signal;
a controller that determines a type of communication period based on the detected synchronization signal and generates a control signal based on the determined type of communication period;
a signal linearizer that controls a linearization operation of the received signal based on the generated control signal. The signal linearizer is
at least a portion is activated when the type of communication period is a downlink communication period, and at least a portion is deactivated when the type of communication period is not the downlink communication period; Item 12. A repeater according to Item 11. The signal linearizer is
12. The repeater of claim 11, performing Digital Pre-Distortion (DPD) on the received signal. The signal linearizer is
12. The repeater of claim 11, performing Adaptive Pre-Distortion (APD) on the received signal.

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